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x in (-oo:+oo)
y = 4-((3*x^4)/3) // - 4-((3*x^4)/3)
(3*x^4)/3+y-4 = 0
1*x^4 = -(y-4) // : 1
x^4 = 4-y
x^4 = 4-y // ^ 1/4
abs(x) = (4-y)^(1/4)
x = (4-y)^(1/4) or x = -(4-y)^(1/4)
x in { (4-y)^(1/4), -(4-y)^(1/4) }
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